introduce
Urban sewage pipe network system is related to the comprehensive development of the city and is the infrastructure to grasp the main artery of the city. The center of its work lies in the collection and treatment of sewage. The economic level and planning development degree of different cities are different, and the specific situation of urban sewage pipe network construction is also different. As far as the construction and management of urban sewage pipe network in China are concerned, the development is obviously behind other countries, and there are many problems in the construction and management of urban sewage pipe network. There are some problems such as uncoordinated operation of sewage pipe network and sewage treatment plant, unclear pollution sources, incomplete rain and sewage diversion, and inadequate maintenance, which are related to the systematic operation of urban sewage pipe network.
1 Present situation of urban sewage pipe network
The treatment of 1. 1 is unclear.
That is, in terms of rainwater and sewage treatment, it is impossible to carry out diversion. This is also the unified disadvantage of sewage pipe network in most cities in China. The mixed connection of rain and sewage affects the sewage collection capacity of sewage treatment plants. On the other hand, rainwater is directly poured into sewage without diversion, causing unnecessary water pollution.
1.2 The drainage system is not uniform.
There are contradictions between the old and new urban drainage systems, that is, the combined drainage system in the old urban area and the separate drainage system in the new urban area. The split-flow system and the combined-flow system coexist, so they can't operate in a unified way. The docking of the two drainage systems causes mixed flow of rain and sewage.
1.3 municipal pipe network is not perfect.
The main reasons for the problem of "no rain and no pollution, mixed rain and sewage discharge" in cities are that the construction of sewage pipe network is imperfect and the drainage system in new and old cities is not matched. The pipe network construction in the new urban area has a large area and a large amount of work, but it lacks comprehensive consideration from all angles and only pays attention to the construction of road network and rainwater pipe network, which leads to the lag of sewage collection pipe network construction. [1] There was no unified planning when the project was developed, and most of the newly developed projects were illegally connected to the existing rainwater pipes nearby. In the later period, sewage pipeline laying was affected by incomplete information, so effective measures could not be taken to separate rain and sewage, resulting in permanent mixed flow of rain and sewage.
1.4 The drainage connection pipe is incorrect.
The unreasonable takeover of drainage users and the confluence of internal rain and sewage have brought a series of governance problems. The supervision department of urban drainage system is not perfect. Failing to carry out relevant inspections and eliminate hidden dangers in time, and failing to carry out follow-up management after the project construction, resulting in the problem that newly-built sewage pipes are artificially connected to municipal or residential rainwater pipes, resulting in mixed flow of rain and sewage. The project is buried deeply, which is not suitable for rectification construction, and it increases the difficulty of subsequent rain and sewage diversion.
1.5 mixed connection of drainage pipe network.
Urban sewage collection system lacks forward-looking integrated design. The scale of the system is small, the standard is low, and it is not unblocked in time during operation, which leads to congestion. After the amount of rainwater and sewage increases, the fragile sewage system cannot meet the drainage demand. Therefore, the drainage management department can only partially open the rainwater and sewage system, which also objectively causes the mixed flow condition of sewage and rainwater.
Design of urban sewage pipe network system
2. 1 Forward planning.
Urban sewage pipe network system should be unified planning, construction and supervision. That is, to realize the simultaneous construction of centralized sewage system and factory construction, systematically plan the completed sewage pipelines and bring them into the supervision system, with the aim of reducing the pollution to the city and surrounding water bodies and further preparing corresponding conditions for centralized treatment of urban sewage. The design of sewage pipeline under the road should first plan the main sewage pipeline to lay the foundation for the subsequent laying of sewage branch pipes, and the two should cooperate with each other to form a unified treatment system. Make the construction of drainage system really adapt to the development of the situation and the pace of development.
2.2 Systematic construction.
The construction of separate drainage pipes in urban residential sewage pipe network should be systematized. The collection and drainage objects of the separate drainage system are rainwater and sewage. Urban residential area is the collection end of the separate drainage system, so it is necessary to operate and build a pipe network under the premise of obeying the separate drainage system. In addition, the construction and management of drainage pipe network in the old city should also be brought into systematic construction.
2.3 Interception facilities.
Interception facilities must be installed at the outlet of rainwater pipes discharged into water bodies. Sewage interception wells and sewage interception gates are set to ensure that the sewage interception function of the sewage interception pipe can be brought into play when rainwater is discharged into the outlet of the water body, and the sewage flowing into the water body in the culvert of the rainwater pipe in the dry season and the rainwater in the early rainy season are collected to the sewage treatment plant for treatment, so as to prevent the receiving water body receiving rainwater from being polluted. The interception ratio of different areas should be determined according to the specific situation of each place, and the interception pipe must be equipped with backflow prevention facilities to ensure that there will be no backflow of lake water and river water.
2.4 pipe network construction scale.
After the sewage pipe network system is put into use, its service life is as long as several decades. Because of its large design area and large investment, it is not conducive to the stability of citizens' production and life, and it is not easy to complete systematic transformation. This requires that the service years, sewage discharge standards and land service scope be included in the overall planning of the pipe network to coordinate the needs of urban development. [2] Therefore, the design and construction scale of sewage treatment plants and sewage collection pipe networks need to be forward-looking to meet the demand of urban sewage discharge growth in a certain period of time.
2.5 Application of sand-filled glass steel pipe.
Glass fiber reinforced plastic pipe with sand is a new type of pipe imported from China in the 1990s. It is widely used because of its advantages of light weight, low resistance to conveying liquid, water quality assurance, chemical corrosion resistance and electric corrosion resistance. In actual construction, the glass fiber reinforced plastic sand pipe has the advantages of convenient installation, long service time, less investment, simple operation and maintenance, and is also widely used in water supply, drainage and industrial water treatment systems. Compared with traditional pipes, it has the advantages of high strength, light weight, long pipe section, few joints, good mechanical properties, no secondary pollution, guaranteed water quality, good corrosion resistance, flexible connection mode and good thermal insulation performance. Low thermal expansion coefficient. In use, it can be used under various harsh conditions such as ground, underground, high altitude, seabed, cold, desert, freezing, humidity, acid and alkali without adding temperature compensation measures.
3 sewage pipe network system management
3. 1 general management.
Comprehensively investigate the operation of the pipe network, clarify the management of property rights, implement responsibilities and objectives, and effectively play the effectiveness of the existing pipe network. Because of the characteristics of sewage pipe network, that is, the management and maintenance are difficult, and because of the lack of understanding of the present situation of sewage pipe network, it leads to multi-head construction and lack of management. The solution needs the cooperation of relevant departments, actively investigate the construction site, collect relevant information, grasp the present situation of the pipe network, and then manage the sewage pipe network operation system under the premise of clarifying the property right scope of the sewage pipe network to improve the efficiency of sewage collection and transportation. Gradually establish the evaluation standard of pipe network facilities, and formulate different maintenance schemes according to different situations.
3.2 Participate in environmental protection.
Urban sewage pipe network is related to the vital interests of citizens. Citizens lack understanding of urban sewage pipe network system, which can not effectively distinguish rain and sewage pipes, and also leads to mixed rain and sewage, let alone participate in and supervise the maintenance and management of the pipe network system. Urban sewage pipe network construction and renovation planning should solicit public opinions, encourage public participation through public opinion propaganda, and enhance public awareness of environmental protection.
4 conclusion
Urban sewage pipe network is the main infrastructure in urban life. The construction and management of sewage pipe network is one of the primary topics of urban development, and management is an important research direction, which deserves further investigation and study by the staff responsible for the construction and management of sewage pipe network.
The above are collected and sorted by Zhong Da Consulting Company.
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